Analysis Of Creep Characteristics Of High-speed Wheel-rail Based On Finite Element Method

The wheel-rail rolling contact problem is one of the key issues of rail vehicles and high-speed trains.A good wheel-rail contact relationship is of great significance to the safe and stable operation of high-speed trains.Wheel-rail creep characteristics are the focus of wheel-rail contact research,which is directly related to the traction performance and braking performance of trains.Therefore,it is of great significance to study and analyze the wheel-rail creep characteristics of trains.Based on the finite element method,this paper analyzes the creep characteristics of wheel-rail rolling contact.The specific research work is as follows:1.First,the classical rolling contact theories such as Carter rolling contact theory and Kalker linear creep theory are analyzed,and the advantages,disadvantages and application scope of different creep theories are compared and analyzed;various classical creep theories and finite element method wheel-rail rolling are compared and analyzed.Different features of contact theory.The analysis shows that the traditional rolling contact theory cannot accurately simulate the actual contact conditions,while the finite element method can accurately simulate the wheel-rail contact and obtain the creep force between the wheel and rail accurately.2.Taking China CRH3 high-speed train trailer wheelset and Chinese standard CHN60 steel rail as the research objects,the finite element model of wheel-rail contact is established by using ABAQUS software.ABAQUS/Standard is used to calculate the wheel-rail steady rolling contact,and the effects of wheel-rail friction coefficient,axle load,wheel-set lateral movement and wheel-rail angle of attack on the wheel-rail creep force are analyzed.The calculation and analysis show that the longitudinal/lateral creep force and the maximum longitudinal/transverse creep force in the contact spot of the wheel are positively correlated with the friction coefficient,and the longitudinal creep force increases rapidly;the longitudinal creep force of the left wheel is almost linear with the lateral displacement The longitudinal creep force of the right wheel decreases gradually with the increase of the lateral movement,and the lateral movement has a great influence on the longitudinal creep force;The sliding force increases gradually;the resultant longitudinal creep force in the contact spot of the revolver increases gradually with the increase of the axle load,and the greater the axle load,the greater the influence on the transverse creep force.3.Using ABAQUS/Explicit explicit solver,the finite element model of wheel-rail transient contact is established,and the influence of wheel-rail friction coefficient and axle load on wheel-rail transient contact characteristics is calculated and analyzed.The analysis shows that in the transient motion process,there are two motion stages,static friction and dynamic friction.The maximum absolute value of the longitudinal creep force in the static friction and dynamic friction stages is positively correlated with the friction coefficient,and the lateral creep force is positive or negative.The greater the weight,the greater the maximum longitudinal creep force,the mean value of the maximum transverse creep force first increases and then decreases,and the axle load has a greater influence on the transverse creep force.